New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  booking: Ember.inject.service(),
  stops: ["Lux", "DUS", "MUC"],
  actions: {
    changeDepartureStop(stop) {
      this.get('booking').set('stop', stop);
    }
  }
});

services.booking.js

import Ember from 'ember';

export default Ember.Service.extend({
  stop: null
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<div> Selected Stops: {{booking.stop}}</div>

<select onchange={{action 'changeDepartureStop' value="target.value"}}>
   <option>Please Select</option>
  {{#each stops as |stop|}}
      <option>{{stop}}</option>
   {{/each}}
 </select>
<br>
<br>

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}